Design is about choices. In this case you can point out:

    1. top-left square logo, dark gray, slab serif, fixed on scroll
    3. bold, large sans-serif title in "off-black"
    4. large serif body text with extended line-height
    5. 100% width image on top

Despite the visual simplicity, there are a lot of variables in effect. It's definitely "inspired" by Medium.

(medium has a few different post layouts, but they share the same spirit: https://medium.com/lift-and-drag/5f803f1482e3 vs https://medium.com/lift-and-drag/51691e99279f)